Charging base



FIG. 1 is a perspective view of the charging base showing my new design;

FIG. 2 is a top plan view of the charger base showing my new design with most of the power cord and the plug omitted for convenience of illustration;

FIG. 3 is a plan view of a first end thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a plan view of a second end thereof;

FIG. 6 is a plan view of a first side thereof; and,

FIG. 7 is a plan view of a second side thereof. 

The ornamental design for a charging base, as shown and described. 